After that cut out the opening. Using the building level, marks are made to draw horizontal lines. Then, using a plumb line, the vertical lines of the future structure are drawn.
First, hold the bottom line of the opening. Then mark the top line.
The height of the opening for the installation of double-glazed windows should be 14 cm higher than the frame size. This is because from the lower border of the opening to the window frame 4 cm are left for mounting foam and a window sill, 4 cm for casing and 5 cm for building shrinkage over the frame.
Using a plumb line, vertical lines are drawn. The opening should be 12 cm wider than the size of the glass unit. At the same time, 1 cm on each side is left for the foam, 10 cm for the casing.
After that, with the help of a building level and a plumb line, horizontal and vertical lines are checked. (more…)